Engine for air-pumps.



P. P. BOURNE.

ENGINE vFOR AIR PUMPS.

APPLICATION FILED JULY 9, 1908.

Patented D60. 8, 1914.

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1HE NoRRls PETERS Co FHoro-LlrHO., WASHINGYON. n. C.

STATESlENT FFICE.

:PHILLIPS P. BOURNE, 0F SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO THE BLAKE& KNOWLES STEAM PUMP WORKS, OF NEW YORK, N. Y., A CORPORATION OF NEWJERSEY.

ENGINE FOR AIR-PUMPS.

Speccation of Letters Patent.

Patented Dee. 8,1914.

Application filed July 9, 1968. Serial No. 442,726. Y

To all whom t may concern Be it known that I, PHILLIPS P. BOURNE, acitizen of the United States, residing at Somerville, county ofMiddlesex, and State of Massachusetts, have invented certain new andusel'ul Improvements in Engines for Air-Pumps, 'fully described andrepresented in the following specification and the accompanyingdrawings, forming a part ol the same.

The object of the present invention is to provide a vertical singleacting air pump, by which a smooth and efficient action shall besecured, notwithstanding the variations in load on the up and downstrokes of the pump.

The further object is to provide an im proved valve movement, adaptedespecially for such pumps.

As a full understanding of the invention can best be given by a detaileddescription of a construction embodying the invention, such adescription will now be given in connection with the accompanyingdrawings forming a part of this specification and showing the inventionapplied in its preferred form, and the features `:forming the inventionwill then be specifically pointed out in the claim.

In the drawings z-Figure 1 is a vertical section oit a single acting airpump embodying the invention. F ig. 2 is a vertical section on the line2 of Fig. l. Fig. 3 is a horizontal section on line 3 of Fig. 2. Fig. lis a detail plan of the auxiliary valve seat showing the auxiliary valvein section.

In the drawings, A is the pump cylinder shown as having the usual singleacting bucket B, and the usual foot, bucket and head valves, C the steamcylinder arranged in line with the pump cylinder' and having the steampiston in line with and directly connected by rod E to the pump bucket,thus forming a direct acting steam pump. It will be understood that bothfoot and head valves are not necessary in the form illustrated and thatsingle acting pumps o' other types may be used. rllhe load in suchsingle acting vertical air pumps in chiefly on the up-stroke, and thisfact, with the weight of the parts acting on the down-stroke, wouldprevent practical opera-tion of the pump, if the steam pressure on thepiston D were the same on both strokes. In pumps embodying my invention,steam is admitted below the piston D on both the up and down strokes,and above the piston D only on the down-stroke, the steam piston beingthus actuated on the up-stroke by steam pressure below the piston actingagainst exhaust above the piston, and on the down-stroke by steampressure above the piston acting against steam pressure below thepiston, so that the effective downward pressure may be varied as desiredin manufacture, according to the working areas on the upper and undersides of the piston, and the downstroke is thus controlled and practicaloperation secured. For this result, the steam chest is connected to thesteam cylinder C below the piston D at all times, and preferablydirectly, and a valve mechanism is used which alternately connects thesteam cylinder above the piston with the inlet chamber of the steamchest and with the exhaust, the steam cylinder above the piston thusbeing connected through the steam chest with the lower side of thepiston during the downstroke.

Referring now to the construction shown, the piston rod E below thepiston D is made of such size as to secure the different areas oil theupper and under sides of the piston desired, according to the size andconditions of operation of the pump. The steam chest F is divided by apartition 11 into inlet chamber 12 and exhaust chamber 13, with whichare connected the admission and exhaust pipes. The inlet chamber 12 iseonnected directly by inlet port a with the steam cylinder C below thepiston D and by inlet and exhaust port Z) with the steam cylinder abovethe piston, the ports a, b being arranged for cushioning and the usualstarting ports l opening to the extreme end of the cylinder being shown,all as well known.

The inlet and exhaust to and from the up` per end of the cylinder C iscontrolled by a steam thrown piston valve, which in turn is controlledby an auxiliary valve actuated by a moving part of the pump. The valvechamber is formed by the sleeve c in which moves the piston valve CZhaving four rings, the sleeve c having the inlet port 2 connecting withthe inlet chamber 12, the port 3 connecting with the inlet and exhaustport b of the upper end of the cylinder C, the exhaust port i connectingwith the exhaust chamber 13, and port 5 which connects with the steaminlet through port 2 and passage 141- in the steam chest, for a purposepresently to be described. rlhe valve Z in one position, as shown in Fig. 2, connects the pcrt Z) of the upper end of cylinder C, with theexhaust chamber 13 through ports 3, .4e for the rip-stroke or" thepiston, and in its other position, as shown in Fig. 3, connects theinlet chamber 12 with the port through ports 2, 3 for the down-stroke ofthe piston. rhe space between the two rings at the right hand end ofpiston Z is supplied with highV pressure steam from inlet chamber 12 atall times through port 2, so that the escape of the cushioning steam tothis space from the space at the right hand of the piston valve CZ isirevented, and by the passage 14 and port 5, which latter port is alwaysopen to the space between the two left hand rings or piston d, the sameresult is secured at the lett hand end of piston valve 0l. The cushionsteam at both ends of the piston valve (l is thus prevented from leakinginto the exhaust cavity, which might cause the piston valve to hit thehead of the valve chamber.

The admission and exhaust of steam at opposite ends of the piston valveCZ, to throw the piston valve in the opposite directions, is controlledby the auxiliary valve e which is shown as sliding transversely to thepiston valve d and sleeve c and as connected by stem 15 and link 16 tolever 17 with lost motion between the lever and link, so that theauxiliary valve'is thus actuated in proper time as the steam pistonapproaches the end of its stroke in either direction, as usual in suchconstructions. Steam is admitted to the auxiliary valve chamber throughport 6 connecting with the steam inlet space about the sleeve c, so thatthe auxiliary valve chamber is constantly supplied with inlet steam, andsteam is admitted from the auxiliary valve chamber to the opposite endsof the piston valve (Z through admission ports 7 and exhausted throughexhaust ports S and the central exhaust port 9 which communicates withexhaust chamber 13. The shiftingV of the valve CZ connects the chambersoutside the opposite ends of the piston valve l with the steam inlet andexhaust alternately for throwing the piston valve Z in oppositedirections, as now well known in similar steam thrown valveconstructions and will be understood from the drawings.

rischia The general operation will be clear from a vbrief description inconnection with the drawings.

Steam is admitted at all times below the piston D throughV port a whichis not controlled by the valve CZ. On the up-strokathe valve Z is in theposition shown in F ig. 2, in which steam isV being exhausted from abovethe piston D through cylinder port sleeve ports 3, 4 connected by valved and The down-,stroke of the pump is thus per-V formed by the excess ofsteam pressure on the top of the piston D, due to the reduction of areaof the piston D on its under side by the piston rod E. rlfhe cylinderspaces on opposite sides of the piston D are directly connected throughinlet chamber l2 and the steam ports during the down-stroke of the pump.During .both the Lip-stroke and downstroke of the pump, the spaces nextthe outer rings of piston valve d are lilled with high pressure steamfrom inlet chamber 12, thus preventing leakage of the valve cushioningsteam past these rings, and thus avoiding the danger of the valve pistonstriking the head on movement in either direction, as above stated. y

l.Vhat I claim is The combination with a steam engine cylinder andpiston, of inlet chamber 12 having a constant connection to one side ofthe steam piston, sleeve c having ports 2, 3, 4 for admission andexhaust on the other side of the steam' piston, and port 5, passage 14connecting port 5 with inlet port 2, steam thrown piston valve dcontrolling the sleeve ports, actuating steam chambers at opposite endsof the piston valve and the spaces inside its end rings being constantlysupplied with inlet steam by ports 2,Y 5, and an auxiliary valve andports for controlling the piston valve, substantially as described.V

lin testimony whereof, have hereunto set my hand, in the presence of twosubscribing witnesses. y

PHILLIPS P. BOURNE., lllitnesses Euro H. NELSON, A. lV. Rumen Copies ofthis patent may be obtained :fo:` five cents each, by addressing theCommissioner of Patents,

Washington, D. C.

